In many BEC realizations, the thermalization rate of the polaritons is much faster that their dissipation rate and pumping rate.
Namely, for long-lived polariton and photon systems, thermalization occurs at pumping rates significantly lower than the condensation threshold [1]}, [2]}.
The relatively high thermal energy in polariton systems at room temperature facilitates phonon- and vibron-assisted polariton relaxation, which, overall, results in efficient polariton thermalization.
A fast thermalization in an organic polariton system has been revealed with an extreme rate on the order of 200 fs [3]}, [4]}.
